Joseph anton dempf



` (No Model.)

J. A. DEMPP.

GIRGUIT GLOSBR.

No. 424,182. Patented Mar. 25, 1890.

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UNITED STATES PATENT OFFICE.

JOSEPH ANTON DEMPF, OF W'ASHINGTON, DISTRICT OF COLUMBIA.

ClRCUlT-CLOSER.

SPECIFIGATION forming part of Letters Patent No. 424,182, dated March25, 1890.

Application filed January 9, 1890. Serial No. 336,445. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH ANTONDEMPF, of Washington city, in theDistrict of Columbia, have invented a new and useful Improvement inCircuit-Closers for Electric Bells, lzc., of which the following is aspecification.

The object of my invention is to provide a circuit-closer or set ofelectrical contacts designed especially for electric bells, butapplicable also to other uses, which shall pernit of the closing of anelectric circuit by pulling on a suspended tassel in contradistinctionto pressing upon a push-button.

It consists in the peculiar construction and arrangement of parts,whichI will now proceed to describe with reference to the drawings, in which-Figure l is a View of the device applied to a suspended tassel and cord,and Fig. 2 is an enlarged sectional view.

A represents a non-conducting block of wood or similar material, havinga flange a at its upper end and a bulbous projection b at its lower end.This block is bored out with three different diameters, the largest atthe top and the smallest at the bottom. Atthe bottom of the upper andlargest bore are placed two detached segments B B' of a circular metalring, which segments are insulated from each other and form the terminalcontact-plates of the two circuit-wires b' b2.

C is a hollow metal stem having a' disk or plate c at its upper end,which fits the largest or upper bore of the block, and the stem of whichdisk extends through the smallest and lowest bore to a position belowthe bulbous end of the block.

other shape than segnental, and may also be constructed as springs oryielding contacts.

In applying the circuit-closer to electric-bell circuits, the flange ofthe block A is screwed up against the ceiling, and the pull-cord andtassel are connected to the hollow sten C. The device may, however, beused in other positions.

I am aware that it is not broadly new to closecontact in an electriccircuit by a vertical spring-seated stem arranged to be pulled formingalso the conductor for connecting the two terminals B B' which arelocated at the bottom of the larger bore. To stop the upward movement ofthe disk c, a bridgeplate or d'iametrical cross-piece p is fastened tothe block directly across the chamber. By making the stem C hollow,also, the cord may be inserted into the same in connecting it theret-o,so as to avoid an unsightly knot, and also the fraying or cutting of thecord.

Having' thus described my invention, what I claim as new is- Thecombination, with the block A, bored or chambered with three diferentdiameters, the largest being at the top and the smallest at the bottom,of the two terminals B B', placed at the bottom of the largest diameter,the stem C, passing through the smallest diametcr and having a disk cfitting the largest diameter, a spiral spring wound about the stem andhaving its lower end bearing against the bottom of the middle bore andits upper end against the disk c, and a bridge-plate or stop p, arrangedacross the top of the largest bore or chamber to limit the upwardmovement of the disk, s'ubstantially as shown and described.

The above specification of my invention signed by me in the presence oftwo subscribing witnesses.

JOSEPH ANTON DEMPF.

Witnesses:

Enwn. W. BYRN, SoLoN O. KEMioN.

